#include<stdio.h>
#include<string.h>

#define N 100

void hantei(const char a[]){
  char s1[]="OOO";
  char s2[]="XXX";
  char *east;
  char *west;

  if(east = strstr(a,s1)) printf("East");
  else if(west = strstr(a,s2)) printf("West");
  else printf("NA");

}

int main(){
  char S[N];
  scanf("%s",S);

  hantei(S);

  return 0;
}